.header{
  position: relative;
  background-color: #253041;
  box-sizing: border-box;
  width: 100%;
  height: 70px;
  font-size: 22px;
  color: #ffffff;
}
.header .logo{
  float: left;
  margin-left: 50px;
  line-height: 70px;
}
.user{
  float: right;
  display: flex;
  align-items: center;
  height: 70px;
  padding-right: 50px;
}
.user img{
  display: block;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  margin-right: 10px;
}
.user .username{
  color: #ffffff;
}